What's the main topic?, Hygiene, Europe in the Middle Ages, Epidemics, The Black Death, What's the main topic?, Folk dances, Folk dancers, Folk dance choreographers, Development of written dance movements, What's the main topic?, A new route to India, The Discovery of America, Columbus's discoveries, Emigration to the new world, What's the main topic?, The languages spoken in the U.S., English as the official language in the U.S., No official language in the U.S., The U.S. as an English-speaking country

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